The White Tower of Thessaloniki was constructed in the 1530s by the Ottomans after they captured the city in 1430. It stands 27 meters tall and was originally built to guard the eastern end of the city's sea walls. The tower now houses a museum dedicated to the history of Thessaloniki and is a prominent symbol of Greek sovereignty over Macedonia. It displays exhibitions about life in Byzantine times and the various periods of the city's history.